msem-instigator

Target creature gains deathtouch until end of turn.
Draw a card.

Pride Ridge enters tapped.
{T}: Add {G} or {W}.
{2}{G}{W}: Until end of turn, Pride Ridge becomes a Cat creature with vigilance in addition to its other types.
Scavenge {2}{G}{W}

Prevent all damage target spell or permanent would deal this turn. You gain life equal to the damage prevented this way.

I — Reveal the top four cards of your library. Put a creature card with mana value 4 or less from among them onto the battlefield and the rest into your graveyard.
II — Any number of target creatures you control fight target creature you don't control.
III — Put up to three target cards from your graveyard on top of your library in any order.

Flying, haste
Ride {1}{R} ({1}{R}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

When Militant's Standard enters, draw a card if you control a Merfolk.
Equipped creature gets +2/+1.
Equip {2}

Creatures you control have deathtouch as long as they're attacking.
[+1]: Target creature you control must be blocked this turn if able.
[–2]: Create two 1/1 white Human creature tokens.
[–X]: Destroy target artifact or enchantment with mana value X and all other permanents with the same name as that permanent.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Other artifacts you control have extort.
Whenever a spell you control resolves, if it was extorted three or more times, each opponent discards a card and you draw a card.

When Abomination Broodmother dies, create a 3/2 green Horror creature token.

Rapport — Whenever Memorial of Forgotten Heroes and at least one other creature you control become tapped, put a +1/+1 counter on one of those creatures.
{T}, Tap an untapped creature you control: Add one mana of any color.

Destroy target enchantment. If it's a Curse, you gain 3 life.

As Sunlit Highland enters, you may pay 2 life. If you don't, Sunlit Highland enters tapped.
{T}, Sacrifice Sunlit Highland: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

At the beginning of your end step, if you cast no spells this turn, untap target creature.

{B}: Veilborn Hunter gets +1/+1 until end of turn.
Sacrifice another creature: Veilborn Hunter gains indestructible until end of turn. Tap it.

Counter target creature spell.

When Warden of the Archives enters, if you cast it, tap up to four target permanents.

This spell costs {1} less to cast for each card type among cards in your graveyard.
Deathtouch

Whenever Ashen Host becomes the target of a spell, Ashen Host deals 2 damage to any target.

Rhapsody {4}{U}{U} (Pay {4}{U}{U} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
Whenever you cast a noncreature spell, Triumvirate Inductee gets +1/+1 until end of turn. Then if its power is 4 or greater, you may tap or untap target permanent.

{T}: Add one mana of any color.
{W}{U}{B}{R}{G}, {T}, Exile Feather of the Simurgh: Exile a white enchantment card, a blue instant card, a black battle card, a red sorcery card, and a green creature card from your graveyard. If you exiled five cards this way, cast any number of them without paying their mana costs.

Reach
When Ambush Predator enters, you may return target Horror creature card from your graveyard to your hand.
When Ambush Predator dies, exile it and create a 3/2 green Horror creature token.

If a player would draw one or more cards except for the first one they draw in each of their draw steps, they exile a card from their hand before they draw those cards.
{1}, {T}: Until end of turn, you may play target card exiled with Compromised Vault, and you may spend mana as though it was mana of any color to cast that spell.

Alpha (You may have this creature enter with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Ruthless Predator can't be blocked by more than one creature.

Whenever you attack, create an X/X red Elemental creature token that's tapped and attacking, where X is the number of attacking creatures.
Fleeting {1}{R} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

This spell costs {1} less to cast for each card you've drawn this turn.
Create three 1/1 white Soldier creature tokens.